Merge pull request #281 from Verkister/master

Little but possibly hella important fixes

code/controllers/subsystem/air.dm

@@ -219,7 +219,7 @@ var/datum/subsystem/air/SSair
 		var/turf/open/T = currentrun[currentrun.len]
 		currentrun.len--
 		if (T)
-			T.process_cell(fire_count)
+			T.process(fire_count)
 		if (MC_TICK_CHECK)
 			return
 

code/controllers/subsystem/processing/overlays.dm

@@ -99,8 +99,9 @@ var/datum/subsystem/processing/overlays/SSoverlays
 			overlays[i] = iconstate2appearance(overlays[i])
 		else
 			var/image/I = overlays[i]
-			appearance_bro.appearance = overlays[i]
-			appearance_bro.dir = I.dir
+			appearance_bro.appearance = I
+			if(isturf(src))
+				appearance_bro.dir = I.dir
 			overlays[i] = appearance_bro.appearance
 
 	var/list/cached_overlays = our_overlays	//sanic
@@ -129,8 +130,9 @@ var/datum/subsystem/processing/overlays/SSoverlays
 			overlays[i] = iconstate2appearance(overlays[i])
 		else
 			var/image/I = overlays[i]
-			appearance_bro.appearance = overlays[i]
-			appearance_bro.dir = I.dir
+			appearance_bro.appearance = I
+			if(isturf(src))
+				appearance_bro.dir = I.dir
 			overlays[i] = appearance_bro.appearance
 
 	LAZYINITLIST(our_overlays)	//always initialized after this point